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a
Open type, with poorly-developed blood vessels
b
Open type, with well-developed blood vessels
c
Closed type, with poorly-developed blood vessels
d
Closed type, with well-developed blood vessels
answer is A.
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Detailed Solution
Blood vascular system of cockroach is of open type. Blood vessels are poorly developed and open into space (haemocoel). Visceral organs located in the haemocoel are bathed in blood (haemolymph).